Question

Purple petal color in pea plants is dominant to white petal color. Two heterozygous pea plants are crossed.

Determine the genotype of the offspring.
1

2

3

4

Answer 1

Let P = purple (dominant) and p = white (recessive). Parents: Pp × Pp.

Punnett square offspring (1–4):
1. PP
2. Pp
3. Pp
4. pp

Phenotypes: 1, 2, 3 = purple; 4 = white (ratio 3 purple : 1 white).